lect_4oct6f09-1

lect_4oct6f09-1 - Outline 4 6-OCT-2009 1. Review atomic...

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1 Outline 4 6-OCT-2009 1. Review atomic mass (average), PT, 2. Ionic Compounds (cont.) Predict charge (monatomics), Write formula, Names Skill: ions ↔ formula ↔ name hydrates and acids 3. Molecular (Covalent) Compounds (cont.) Binary: Names Skill: formula ↔ name 4. Formula Masses
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2 Atomic Mass: Review Given: data for element, X, with only 2 isotopes ISOTOPE ISOTOPIC MASS (amu) %ABUNDANCE X-69 68.9256 60.11 X-71 70.9247 ? Find: (a) abundance of X-71 (b) Atomic mass (c) element Do on board
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3 Modern form of the periodic table.
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4 Group- Elements in column Group- Elements in column Period – Elements in row Period – Elements in row Metals- Metals- Non-metals- Non-metals- Metalloids Metalloids Periodic Table
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5 Name________ Sample Quiz 4 TA ______ 1. (3) Rb has two isotopes. mass (amu) fraction 85 37 Rb 84.9 0.722 87 37 Rb 86.9 0.278 Find: avg mass = ? * ? + ? * ? = 2. (2) Write symbol of the element at intersection of : a. Group 2 and Period 3. b. Group 17 and Period 4.
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6 Compounds: Review Compound- Substance (fixed composition, definite proportions) with two or more elements. Two Models Ionic – exchange e - ’s ; metal (cation) & nonmetal (anion) Ca → Ca +2 + 2e - ; a cation (atom gave e - ’s) O + 2 e - → O -2 ; ; an anion (atom took e - ’s) CaO Molecular (covalent) share e - ’s; 2 or more nonmetals 2 H + O → H-O-H , - represents a bond . (Ch. 9) H 2 O
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7 Compound Formulas: Review Chemical formula - shows atomic symbols with subscripts indicating relative proportions of atoms of different elements in compound. (Law of Definite Proportions) • Ex.: (a) N 2 O 5 (dinitrogen pentoxide) Formula implies compound composed of O to N in ratio 5:2 . Molecular or Ionic? (b) Cr(NO 3 ) 2 (chromium (II) nitrate) Molecular or Ionic? (Will start naming today!) Will work on Ionic Compounds first.
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8 Anion –formed when atom picks up extra e - ’s so becomes negatively (-) charged ion, Ex: O + 2 e - O -2 Ionic Compounds: Review (1) Ionic substances Cation – formed when atom loses e - ’s so becomes positively (+) charged ion. Ex: Na → Na + + e - Ionic compound - compound composed of cations and anions . . Ex: Na Ex: Na 2 O O
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9 Metals (main group) – cations (+) with charge = group number . Ex: Mg; 2A so Mg +2 or Mg 2+ Metals (transition) -form more than one cation, each with different charge. Slide 10. Ionic Compounds: Charge (monatomic 1) Predicting charge on monatomic ions Use PT! Nonmetals- anions (-) with charge = group number minus 8. Ex: O; 6A so (6 - 8 = -2) so O -2 or O 2-
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10
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11 Ionic Compounds : Charge (monatomic 2) What charge is expected for Al? In Group 3 A (III A) in PT (metal)
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This note was uploaded on 10/14/2011 for the course CHEM 1A taught by Professor Okamura during the Spring '08 term at UC Riverside.

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lect_4oct6f09-1 - Outline 4 6-OCT-2009 1. Review atomic...

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